【摘要】 <正> α—羰基烯酮环二硫代缩醛类化合物1作为一类活泼中间体用于合成中是一新的课题。因1中缩醛基以环的形式存在,环的刚性及二个疏原子利用非键3P轨道和碳碳π键的共轭作用 (P —π)与缩醛基为非环状的α—羰基烯酮二甲硫代缩醛类化合 物2的这类作用不同,造成这两类化合物的反应活性和性能 差异较大。为从结构上探讨产生这些差异的本质原因, 我们对标题化合物1a进行了x射线单晶结构测定。更多还原

【Abstract】 The crystal structure of the title compound was determined by X-ray diffraction method. The crystal belongs to the orthorhombic system, space group Pcab with the unit cell parameters: a =0.9050(4), b= 1.2213(4), c= 1.7415(7)nm, Z=8, Dx=1.38g/ cm3, F(OOO) = 848, R= 0.053 for 1405 observed reflections with I≥1.5σ( I ). The two S-Csp2 bond lengths are nearly equal: 1.757(3) and 1.759(3)nm. These bond lengths show that the electronic effects between two sulphur atoms and the carbon carbon double bond might be similar.更多还原