Linear Ketenimines. Variable Structures of <i>C</i>,<i>C-</i>Dicyanoketenimines and <i>C</i>,<i>C</i>-Bis-sulfonylketenimines
作者:Justin Finnerty、Ullrich Mitschke、Curt Wentrup
DOI:10.1021/jo010398x
日期:2002.2.1
these ketenimines have variable geometry, being essentially linear along the CCN-R framework in polar media (neat films and solution), but in the gas phase or Ar matrix they are bent, as is usual for ketenimines. Experiments and calculations agree that a single CN substituent as in 13 is not enough to enforce linearity, and sulfonyl groups are less effective that cyano groups in causing linearity. C,
C,C-二氰基酮亚胺10a-c是通过乙烯酮N,S-乙缩醛9a-c的快速真空热解或α-叠氮基-β-氰基肉桂腈11的热或光化学分解生成的。在后一反应中,3,3-二氰基还形成了-2-苯基-1-叠氮基12。在Ar基质中或整齐的薄膜中分离出的酮亚胺的红外光谱,10c NMR光谱和理论计算(B3LYP / 6-31G)表明,这些酮亚胺具有可变的几何形状,在极性介质中沿CCN-R骨架基本上是线性的(薄膜和溶液),但它们在气相或Ar基体中弯曲,这是氯胺酮的常用方法。实验和计算得出的结论是,如13中所述的单个CN取代基不足以增强线性度,而磺酰基在导致线性度方面不如氰基有效。C,C-双(甲基磺酰基)酮亚胺4-5和C-氰基-C-(甲基磺酰基)酮亚胺15不是线性的。先前在文献中报道的化合物p-O2NC6H4N = C = C(COOMe)2可能沿CCNR部分线性化。氮原子转化阻挡层的计算调查(B3LYP / 6-