Dialkylborane amine complexes

A dialkylborane amine complex of the formula (1)

• (R1)2BH•amine (1),
• wherein
• R1 is C1—C10 alkyl, C3—C10 cycloalkyl, C6—C14 aryl, C7—C16 aralkyl, C7—C16 alkaryl, C2—C10 alkenyl, C2—C10 alkynyl, substituted C1—C10 alkyl, CH2SiMe3, isopinocampheyl, or the two R1 groups together with the BH moiety connecting them are 9-borabicyclo[3.3.1]nonane, boracyclopentane, 3-methyl-1-boracyclopentane or 3,4-dimethyl-1-boracyclopentane, and
• amine represents quinoline, quinoxaline or a substituted pyridine of the formula (2)
• wherein
• R2 is methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, sec-butyl, amyl, isoamyl, sec-amyl, 1,2-dimethylpropyl, n-hexyl, 4-methylpentyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 2,2-dimethylbutyl, 3,3-dimethylbutyl, 1,2-dimethylbutyl, 1,3-dimethylbutyl, 1,2,2-trimethylpropyl, n-heptyl, 5-methylhexyl, 1-methylhexyl, 2,2-dimethylpentyl, 3,3-dimethylpentyl, 4,4-dimethylpentyl, 1,2-dimethylpentyl, 1,3-dimethylpentyl, 1,4-dimethylpentyl, 1,2,3-trimethylbutyl, 2-ethylhexyl, n-octyl, 6-methylheptyl, 1-methylheptyl, n-nonyl, 1-, 2-, 3-, 4-, 5-, 6- or 7-methyloctyl, 1-, 2-, 3-, 4- or 5-ethylheptyl, 1-, 2- or 3-propylhexyl, n-decyl, 1-, 2-, 3-, 4-, 5-, 6-, 7- or 8-methylnonyl, 1-, 2-, 3-, 4-, 5- or 6-ethyloctyl, 1-, 2-, 3- or 4-propylheptyl, C1—C8 alkoxy or C1—C8-alkoxy-C1—C10 alkyl, and
• R3 is hydrogen or a C1—C10 alkyl, C1—C8 alkoxy or C, —C8-alkoxy-C1—C10 alkyl group, which is not bound to the 6-position of the pyridine ring,
• with the provision that R3 is not hydrogen and the amine in (1) is not quinoline when the dialkylborane is 9-borabicyclo[3.3.1]nonane.