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The structures of hexahydro-2-aryloxy-2-thiono-3-methyl 1,3,4,2-thiadiazaphosphorin-5-ones have been studied by means of IR spectra and X-ray diffraction method. The IR spectra show that the C=O absorption of the keto-form(la) is near 1715cm-1 and C=N absorption of enol-form near 1660cm-1. The crystals are monoclinic with space group P21/a,a= 14. 029(3) ,b=8. 353(2) ,c=23. 353(6) A ,β= 107. 01 2)°. There are four pairs of molecules in keto- (1a) and enol-form (1b) per unit cell. The C=O and C(2)- N(2) distances of keto-form are 1. 21 and 1. 37 A Respectively, While the C(2)-O and C(2) = N(2) distances of enol-form 1. 316 and 1. 326A respec-evely. The rings of hexahydro-1,3,4,2-thiadiazaphosphorine for keto- and enol-form are toth in boat conformation.
The structures of hexahydro-2-aryloxy-2-thiono-3-methyl 1,3,4,2-thiadiazaphosphorin-5-ones have been studied by means of IR spectra and X-ray diffraction method. The IR spectra show that the C = O absorption of the keto-form (la) is near 1715 cm -1 and C = N absorption of enol-form near 1660 cm -1. The crystals are monoclinic with space group P21 / a, a = There are four pairs of molecules in keto- (1a) and enol-form (1b) per unit (b). b = 8. 353 (2), c = The C = O and C (2) - N (2) distances of keto-form are 1.21 and 1.37 A Respectively, while the C (2) -O and C (2) = N (2) distances of enol-form 1. 316 and 1. 326A respec-evely. The rings of hexahydro-1,3,4,2-thiadiazaphosphorine for keto- and enol-form are toth in boat conformation.