Unequivocal proof of slowed chromium tricarbonyl rotation in a sterically crowded arene complex: An X-ray crystallographic and variable-temperature high-field NMR study of (C6Et5COCH3)Cr(CO)3

Article abstract of DOI:10.1021/ja00157a007

The low-temperature ¹³C NMR spectrum of (C₆Et₅COCH₃) Cr(CO)₃ is explicable only in terms of a single sterioisomer, i.e., the 1-proximal-acetyl-2,4,6-distal-3,5-p roximal conformer. The Cr(CO)₃