Crystal structures of 6-cyclopropyl-1,3-diphenylfulvene and 6-(2,3-dimethoxynaphthyl)-1,3-diphenylfulvene

Abstract

The title compounds, 6-cyclopropyl-1,3-diphenylfulvene, C21H18, [systematic name: 5-(cyclopropylmethylidene)-1,3-diphenylcyclopenta-1,3-diene], 1, and 6-(2,3-dimethoxynaphthyl)-1,3-diphenylfulvene, C30H24O2, {systematic name: 5-[(3,4-dimethoxynaphthalen-2-yl)methylidene]-1,3-diphenylcyclopenta-1,3-diene}, 2, were prepared from 1,3-diphenylcyclopentadiene, pyrrolidine, and the corresponding aldehydes in an ethanolic solution. Each structure crystallizes with one molecule per asymmetric unit and exhibits the alternating short and long bond lengths typical of fulvenes. A network of C—H...C ring interactions as well as C—H...O interactions is observed, resulting in the compact packing found in each structure.