“…2-(Phenylamino)cyclopentane-1-carbonitrile (3a). 12 Cycloadduct 3a was obtained after silica gel column chromatography (EtOAc/PE = 1:10) as a separable mixture of two diastereoisomers (trans/cis = 2, 129.5, 122.4, 118.4, 113.4, 59.4, 35.4, 33.3, 29.6, 23.6 129.5, 120.4, 118.5, 113.7, 56.9, 34.3, 31.3, 28.9, 21.3 122.2, 114.5, 59.5, 35.4, 33.3, 29.6, 23.6 129.4, 123.1, 120.2, 114.8, 56.9, 34.2, 31.4, 28.9, 21.5…”