Preparations of Hexyleneglycol Alkylboronic Esters

In a study on an enantioselective version of rhodium-catalyzed hydroboration of alkenes the influence of the nature of the hydroboration agent was studied in detail. Twelve cyclic dialkoxyboranes, including catecholborane 

Although it does not involve any hexyleneglyeol, the following example is highly representative of the importance of the nature of the protecting diol when cyclic boronic esters are intermediates. 

4 Conjugate Addition with Diboron Reagents and Diboration 

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