Crystal structure of seven-membered acetals with furan and pyridine planar fragments
作者:V.Yu Fedorenko、O.A Lodochnikova、A.S Petukhov、O.N Kataeva、I.A Litvinov、Yu.G Shtyrlin、E.N Klimovitskii
DOI:10.1016/s0022-2860(02)00478-7
日期:2003.1
X-ray structure investigation of fused seven-membered acetals based on vitamin B6 and 3,4-bis(hydroximethyl)furan have been performed. Molecules adopt chair conformations with equatorial position of substituents at acetal carbons; the geometry of acetal cycles resembles that of related seven-membered phthalylacetals. Stereochemistry of the tetracyclic adduct of furan-containing acetal with maleic anhydride
摘要 对基于维生素 B6 和 3,4-双(羟甲基)呋喃的稠合七元缩醛进行了 X 射线结构研究。分子采用椅子构象,缩醛碳上的取代基位于赤道位置;缩醛循环的几何形状类似于相关的七元邻苯二甲缩醛。还研究了含呋喃缩醛与马来酸酐的四环加合物的立体化学。该产品呈现出具有明显扭曲的七元椅子状构象的内-外构型。