2-Norbornene → Beta-Pinene

To a 50 ml glass vial equipped with a Teflon® coated stirbar was added -pinene (2.5 ml), norbornene (5 g, 53.1 mmol) and chlorobenzene (35 ml). To this stirred solution at ambient temperature was added nickel ethylhexanoate (0.01 ml of an 8% w nickel solution in mineral spirits, 13 μmol) tris(pentafluorophenyl)boron (117 μmol in petroleum naphtha) and triethylaluminum (0.077 ml of a 1.7 molar solution in cyclohexane, 130 μmol). Immediately upon addition of the trialkylaluminum the reaction mixture became yellow and hot. The reaction was allowed to run for 60 minutes after which time methanol (3 ml) was injected to kill the reaction and the resulting solution was poured into excess methanol. The polymer was filtered off and washed with excess methanol and dried overnight in a heated vacuum oven to afford the copolymer (4.0 g). GPC analysis showed the polymer to have a molecular weight (Mw) of 39,800 and a polydispersity of 2.1.

1. customthe reaction
2. filtrationThe polymer was filtered off
3. washwashed with excess methanol
4. customdried overnight in a heated vacuum oven

ORD record

ord-88c985e030da47ff82ed69c6c301dd97

Source dataset

uspto-grants-1997_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05677405