P(CH2CH2CN)3 (10 equiv.) showed slightly broadened sing- lets for the two components, indicating that complex 1 has surprisingly little tendency to form the four-coordinate ... CI, 'PR3 c Pt i R3P' %I H PR3 * 'pi ii R3P' %I ... [ Pt( norbomyle ne)3] Scheme 1 Reagents and conditions (R = CH2CH2CN): i, 2 equiv. PR3 in CH2C12; ii, NaBH4 in MeCN; iii, CH2=CHCN in MeCN followed by NaBH,; iv, 1 equiv. of PR3 in MeCN followed by NaBH4; v, 1 equiv. of PR3 and Et,N in ...