Limonene phosphite-modified rhodium catalysts

Using phosphite-modified rhodium catalysts, otherwise unreactive alkenes, such as 2-methyl-l-hexene, limonene and cyclohexene, are hydroformylated under mild conditions. " 2-Methyl-1-hexene, for example, yields almost exclusively 3-methylheptaldehyde, which is in contrast to the result of cobalt catalysis where a compound with a quaternary carbon is formed (Scheme 12). 

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