Molecular structure and infrared spectra of the monomeric 3-(methoxy)-1,2-benzisothiazole 1,1-dioxide (methyl pseudosaccharyl ether)
作者:Agnieszka Kaczor、Rui Almeida、Andrea Gómez-Zavaglia、Maria de Lurdes S. Cristiano、Rui Fausto
DOI:10.1016/j.molstruc.2007.06.004
日期:2008.3
exhibit considerably short (1.320 A) and long (1.442 A) (N )C O and (H 3 )C O bonds, respectively, and a hybridization of the central oxygen atom close to sp 2 (the C O C angle is predicted to be ca. 117°). This C O C bonding pattern fits the well-known high reactivity of MBID upon thermal rearrangement, which has been shown to result in easy selective [1,3′]-isomerization of the compound.
摘要 糖精 (1,2-benzisothiazol-3(2 H )-one-1,1-dioxide) 及其衍生物由于其结构中存在高价 SO 键而难以计算描述。因此,在本研究中,使用 HF、DFT/B3LYP 和 MP2 方法来预测糖基衍生物 3-(甲氧基)-1,2-苯并异噻唑 1,1-二氧化物 (MBID) 的几何形状和红外光谱。然后通过将获得的结果与实验可用的数据(即新获得的在低温惰性基质中分离的 MBID 的红外光谱)进行比较来评估它们的相对预测能力。对于每种方法,不同的基组 [6-31++G(d,p), 6-31++G(3df,3pd), 6-311++G(d,p), 6-311++G (2df,2pd)、6-311++G(3df,3pd)、aug-cc-pVDZ 和 aug-cc-pVTZ] 被考虑。在 B3LYP/6-311++G(3df,3pd) 和 B3LYP/6-31++G(3df