water 1.) CH2Cl2, -78 deg C -> r.t.; 2.) r.t., ether, 4 h; Yield given. Multistep reaction;

1: 2-Isopropyl-1,3-butadiene; isopropylmagnesium chloride With NiCl2((PPh3)P)2 in tetrahydrofuran T=20°C; Grignard reaction; 2: carbon dioxide in tetrahydrofuran Title compound not separated from byproducts;