Methoxy and nitro substituent effects and anchimeric assistance in

1,3,7-OT. 1,5-. +VCH. COD “Others”. 1. None. 400. 120. 14. 0. 100. 2. (Ph3P)3Pt, 0.5. 400. 120. 18. 4. 96. 3 .... Anchimeric Assistance in Solvoly...
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5905 Table I. Dimerization of Butadiene"

Expt

Ar, psig

Catalyst, mmol

Nz, psig

COZ,psig 400

1 None 2 (PhaP)aPt, 0.5 3 (Ph,P)rPt, 0.5 4 None 5 (PhsP)J't, 0.5 6 (PhaP)aPt, 0.5 7 (PhjP)sPt, 0.5 8 (PhsP)sPt, 0.5 9 (PhsP)sPt, 0.5

400 400 400 400 400

400

400 300 (+lo0 air)

10 (Ph,P)?(COs)Pt, 0.65 11 (Ph3P)z(COa)Pt,0.65 PhaP, 2.7 12 (Ph,P)i(CO,)Pt, 0.65 PhsP, 2.7 13 (Ph8P)4Ni,0.45 14 (Ph3P)4Ni,0.43 15 [(PhO),P]rNi, 0.43 16 [(PhO)3P]aNi,0.43

>400

>m

+ +

400 400 >400

Temp, "C

Convn,

120 120 120 110 110 110 95 95 120

14 18 30 10 15 21 6 12 13

Product yields," 1,51,3,7-OT CVCH COD "Others" 0 4 68 0 4 75 3 80 20

100 96 32 100 96 25 97 20 80

120 120

17 >68

75 99.6 >99.9 >99.5 95.36

29 5 42 51