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Search Results: 1 - 10 of 29 matches for " Chatchanok Karalai "
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(E)-3-(Anthracen-9-yl)-1-(furan-2-yl)prop-2-en-1-oneThis paper is dedicated to His Majesty King Bhumibol Adulyadej of Thailand (King Rama IX) for his sustainable development of the country.
Jirapa Horkaew,Thitipone Suwunwong,Suchada Chantrapromma,Chatchanok Karalai
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810005982
Abstract: In the molecule of the title heteroaryl chalcone derivative, C21H14O2, the almost planar prop-2-en-1-one unit [r.m.s. deviation = 0.0087 (1) ] forms dihedral angles of 5.81 (7) and 49.85 (6)°, respectively, with the furan ring and anthracene ring system. In the crystal structure, the molecules are linked into a two-dimensional network parallel to (100) by C—H...O hydrogen bonds and π...π interactions involving the furan rings [centroid–centroid distance = 3.7205 (6) ].
Vieillardiixanthone BThis paper is dedicated to His Majesty King Bhumibol Adulyadej of Thailand (King Rama IX) for his sustainable development of the country.
Nawong Boonnak,Suchada Chantrapromma,Hoong-Kun Fun,Chatchanok Karalai
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810007026
Abstract: The title compound [systematic name: 1,5-dihydroxy-3,6-dimethoxy-4-(2-methylbut-3-en-2-yl)-9H-xanthen-9-one], C20H20O6, is a xanthone, which was isolated from the roots of Cratoxylum formosum ssp. pruniflorum. The three rings in the molecule are approximately coplanar, with an r.m.s. deviation of 0.0372 (2) for the plane through the 14 non-H atoms. The O atoms of the two hydroxy substituents also lie close to this plane with deviations of 0.0669 (2) and 0.1122 (2) , respectively. The 1,1-dimethyl-2-propenyl substituent is in a ( )-anticlinal conformation. Intramolecular O—H...O hydrogen bonds generate S(5) and S(6) ring motifs. In the crystal, molecules are linked into infinite chains along [010] by O—H...O hydrogen bonds and weak C—H...O interactions. π–π interactions with centroid–centroid distances of 3.6172 (10) and 3.6815 (10) are also observed.
Absolute configuration of odorine
Hoong-Kun Fun,Suchada Chantrapromma,Orapun Yodsaoue,Chatchanok Karalai
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810034227
Abstract: The title compound, known as odorine or roxburghiline {systematic name: (S)-N-[(R)-1-cinnamoylpyrrolidin-2-yl]-2-methylbutanamide}, C18H24N2O2, is a nitrogenous compound isolated from the leaves of Aglaia odorata. The absolute configuration was determined by refinement of the Flack parameter with data collected using Cu Kα radiation showing positions 2 and 2′ to be S and R, respectively. The pyrrolidine ring adopts an envelope conformation. In the crystal, molecules are linked into chains along [010] by intermolecular N—H...O hydrogen bonds.
(E)-1-(2-Furyl)-3-(2,4,6-trimethoxyphenyl)prop-2-en-1-one
Hoong-Kun Fun,Thitipone Suwunwong,Suchada Chantrapromma,Chatchanok Karalai
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810035762
Abstract: In the title heteroaryl chalcone derivative, C16H16O5, the dihedral angle between the furan and benzene rings is 14.45 (6)°. The three methoxy groups are almost coplanar with their attached benzene ring [C—C—O—C torsion angles = 2.07 (17), 5.04 (17) and 2.85 (16)°]. An intramolecular C—H...O hydrogen bond occurs. In the crystal, adjacent molecules are linked into X-shaped chains along the c axis by weak C—H...O(enone) interactions. These chains are stacked along the b axis. C...O [3.3308 (13)–3.4123 (14) ] short contacts are also observed.
Absolute configuration of isovouacapenol C
Hoong-Kun Fun,Orapun Yodsaoue,Chatchanok Karalai,Suchada Chantrapromma
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810028023
Abstract: The title compound, C27H34O5 {systematic name: (4aR,5R,6R,6aS,7R,11aS,11bR)-4a,6-dihydroxy-4,4,7,11b-tetramethyl-1,2,3,4,4a,5,6,6a,7,11,11a,11b-dodecahydrophenanthro[3,2-b]furan-5-yl benzoate}, is a cassane furanoditerpene, which was isolated from the roots of Caesalpinia pulcherrima. The three cyclohexane rings are trans fused: two of these are in chair conformations with the third in a twisted half-chair conformation, whereas the furan ring is almost planar (r.m.s. deviation = 0.003 ). An intramolecular C—H...O interaction generates an S(6) ring. The absolute configurations of the stereogenic centres at positions 4a, 5, 6, 6a, 7, 11a and 11b are R, R, R, S, R, S and R, respectively. In the crystal, molecules are linked into infinite chains along [010] by O—H...O hydrogen bonds. C...O [3.306 (2)–3.347 (2) ] short contacts and C—H...π interactions also occur.
(E)-1-(4-Bromophenyl)-3-(2,4,6-trimethoxyphenyl)prop-2-en-1-oneThis paper is dedicated to the late Her Royal Highness Princess Galyani Vadhana Krom Luang Naradhiwas Rajanagarindra for her patronage of Science in Thailand.
Suchada Chantrapromma,Thitipone Suwunwong,Chatchanok Karalai,Hoong-Kun Fun
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809010496
Abstract: The molecule of the title chalcone derivative, C18H17BrO4, is twisted, the dihedral angle between the 4-bromophenyl and 2,4,6-trimethoxyphenyl rings being 39.17 (6)°. The three methoxy groups are oriented in two different conformations whereby two methoxy groups are coplanar, whereas the third is twisted with respect to the attached benzene ring [C—O—C—C torsion angles of 2.84 (18), 2.80 (18) and 9.31 (18)°]. Weak intramolecular C—H...O interactions generate two S(5) and one S(6) ring motifs. In the crystal structure, molecules are linked into supramolecular sheets parallel to the bc plane by weak C—H...O interactions. These sheets are stacked along the a axis. The crystal structure is further stabilized by weak C—H...π interactions.
ent-5α,3,15-Dioxodolabr-4(18)-ene-16,18-diol
Hoong-Kun Fun,Charoen Pakathirathien,Chatchanok Karalai,Suchada Chantrapromma
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810042078
Abstract: The title compound, C20H30O4, is a dolabrane diterpenoid isolated from Ceriops tagal, in which one of the three fused cyclohexane rings adopts a half-chair conformation and the other two are in the standard chair conformations. The hydroxymethylidene substituent is attached to the half-chair cyclohexane. An intramolecular O—H...O hydrogen bond generate an S(6) ring motif. In the crystal, molecules are arranged into screw chains along the [001] direction. The crystal is stabilized by O—H...O hydrogen bonds and weaker C—H...O interactions.
(E)-1-(2-Furyl)-3-(3,4,5-trimethoxyphenyl)prop-2-en-1-one
Hoong-Kun Fun,Thitipone Suwunwong,Suchada Chantrapromma,Chatchanok Karalai
Acta Crystallographica Section E , 2010, DOI: 10.1107/s160053681004451x
Abstract: The title molecule, C16H16O5, is twisted; the dihedral angle between the furan and 3,4,5-trimethoxyphenyl rings is 12.14 (13)°. The two methoxy groups at the meta positions of the benzene ring are close to being coplanar with the ring [C—O—C—C = 0.6 (3) and 1.4 (3)°], whereas the third methoxy group, at the para position, is (+)-anticlinal with respect to the benzene ring [C—O—C—C = 104.9 (2)°]. In the crystal, molecules are linked by weak C—H...O bonds to stack along the b axis and further C—H...O interactions consolidate the structure.
(E)-N′-(4-Ethoxybenzylidene)-4-hydroxybenzohydrazide dihydrate
Hoong-Kun Fun,Jirapa Horkaew,Suchada Chantrapromma,Chatchanok Karalai
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812019356
Abstract: The benzohydrazide molecule of the title compound, C16H16N2O3·2H2O, exists in a trans conformation with respect to the C=N double bond. The central O=C—NH—N=C plane [r.m.s. deviation of 0.0165 (1) for the five non-H atoms] makes dihedral angles of 6.04 (8) and 2.38 (8)°, respectively, with the hydroxy- and ethoxy-substituted benzene rings. The dihedral angle between these benzene rings is 3.82 (7)°. The ethoxy group is almost coplanar with the attached benzene ring with a C—O—C—C torsion angle of 176.58 (11)°. In the crystal, the benzohydrazide and water molecules are linked by N—H...O, O—H...O , O—H...N and C—H...O hydrogen bonds into a three-dimensional network.
(E)-N′-(3-Ethoxy-4-hydroxybenzylidene)-4-methoxybenzohydrazide
Hoong-Kun Fun,Premrudee Promdet,Jirapa Horkaew,Chatchanok Karalai
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812007374
Abstract: In the molecule of the title benzohydrazide derivative, C17H18N2O4, the dihedral angle between the benzene rings is 6.86 (11)°. The methoxy group of the 4-methoxyphenyl fragment deviates slightly [Cmethyl—O—C—C = 10.0 (4)°] with respect to the benzene ring, whereas the ethoxy group of the 3-ethoxy-4-hydroxyphenyl fragment is is almost coplanar [C—O—C—Cmethyl = 178.5 (2)°]. In the crystal, molecules are linked by N—H...O, O—H...O and C—H...O hydrogen bonds into a two-dimensional network parallel to the ab plane. C—H...π interactions and C...O [2.980 (3) ] short contacts are also observed.
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