The new title compound 2-methoxy-benzoic acid 2-oxo-3-（2,4,6-trimethyl-phenyl）-1-oxa-spiro[4.4]non-3-en-4-yl ester（3,C25H26O5） has been synthesized by the condensation reaction of 4-hydroxy-3-（2,4,6-trimethyl-phe...The new title compound 2-methoxy-benzoic acid 2-oxo-3-（2,4,6-trimethyl-phenyl）-1-oxa-spiro[4.4]non-3-en-4-yl ester（3,C25H26O5） has been synthesized by the condensation reaction of 4-hydroxy-3-（2,4,6-trimethyl-phenyl）-1-oxa-spiro[4.4]non-3-en-2-one（2） with 2-methoxylben-zoyl chloride,and characterized by 1H NMR and MS spectra.Its crystal structure was determined by single-crystal X-ray diffraction.The crystal is of monoclinic,space group P21/c with a = 10.6945（7）,b = 12.8176（7）,c = 16.4223（10） ,β = 103.5665（17）o,V = 2188.3（2） 3,Z = 4,Dc = 1.234 g/cm3,F（000） = 864.000,μ = 0.085 mm-1,the final R = 0.0520 and wR = 0.1132 for 2732 observed reflections with I 2σ（I）.In the crystal structure,the C（1）-C（2）（1.478 ） bond is significantly shorter than the normal single C-C bond（1.53 ）,suggesting that the carbonyl group on C（1） has formed a conjugated system with a double bond on C（2） and C（12）.展开更多
The anthrone reacts with 2,5-dimethoxybenzaldehyde under base catalyst to afford the title compound (C23H18O3, Mr = 342.37). The crystal belongs to monoclinic, space group P21/c with a = 13.046(4), b = 8.937(2), c = 1...The anthrone reacts with 2,5-dimethoxybenzaldehyde under base catalyst to afford the title compound (C23H18O3, Mr = 342.37). The crystal belongs to monoclinic, space group P21/c with a = 13.046(4), b = 8.937(2), c = 15.549(4) ? b = 106.52(3), V = 1738.1(8) 3, Z = 4, Dc = 1.308 g/cm3, m = 0.086 mm-1 and F(000) = 720. The final R = 0.0331 and wR = 0.0850. The results show that the two phenyl rings of the anthrone fragment are not coplanar, but with a dihedral angle of 157.92. The middle ring of the anthrone moiety appears asymmetric boat conformation, while the 2,5-dimethoxyphenyl ring is restricted rotation. Therefore they exist in two optically active forms which are symmetrical glidingly.展开更多
基金Supported by the National Natural Science Foundation of China (No.30700532)the Science and Technology Project of Zhejiang Province (No.2008C02007-3,2008C21029)
文摘The new title compound 2-methoxy-benzoic acid 2-oxo-3-（2,4,6-trimethyl-phenyl）-1-oxa-spiro[4.4]non-3-en-4-yl ester（3,C25H26O5） has been synthesized by the condensation reaction of 4-hydroxy-3-（2,4,6-trimethyl-phenyl）-1-oxa-spiro[4.4]non-3-en-2-one（2） with 2-methoxylben-zoyl chloride,and characterized by 1H NMR and MS spectra.Its crystal structure was determined by single-crystal X-ray diffraction.The crystal is of monoclinic,space group P21/c with a = 10.6945（7）,b = 12.8176（7）,c = 16.4223（10） ,β = 103.5665（17）o,V = 2188.3（2） 3,Z = 4,Dc = 1.234 g/cm3,F（000） = 864.000,μ = 0.085 mm-1,the final R = 0.0520 and wR = 0.1132 for 2732 observed reflections with I 2σ（I）.In the crystal structure,the C（1）-C（2）（1.478 ） bond is significantly shorter than the normal single C-C bond（1.53 ）,suggesting that the carbonyl group on C（1） has formed a conjugated system with a double bond on C（2） and C（12）.
基金Project supported by the Zhejiang Natural Science Foundation (No. 200016)
文摘The anthrone reacts with 2,5-dimethoxybenzaldehyde under base catalyst to afford the title compound (C23H18O3, Mr = 342.37). The crystal belongs to monoclinic, space group P21/c with a = 13.046(4), b = 8.937(2), c = 15.549(4) ? b = 106.52(3), V = 1738.1(8) 3, Z = 4, Dc = 1.308 g/cm3, m = 0.086 mm-1 and F(000) = 720. The final R = 0.0331 and wR = 0.0850. The results show that the two phenyl rings of the anthrone fragment are not coplanar, but with a dihedral angle of 157.92. The middle ring of the anthrone moiety appears asymmetric boat conformation, while the 2,5-dimethoxyphenyl ring is restricted rotation. Therefore they exist in two optically active forms which are symmetrical glidingly.
