Design, synthesis, characterisation and effectiveness of ‘Locked-in-Boron’ chemicals for H3.2 level of wood protection

IRG/WP 11-30577

R Franich, H Kroese, S Gallagher, S Hill, B Kelly, G Billett, R Meder, W Rae

Boratrane molecules with five-membered and six-membered molecular ring systems, and with various ring substituents were synthesised, characterised and formulated for wood treatment for accelerated laboratory bioassays using wood decay fungi as test organisms. Six-membered ring boratranes showed lower efficacy in laboratory assays than five-membered ring boratranes. One alkyl-substituted boratrane with a five-membered ring molecular structure was used in a 10-year natural hazard exposure test using lap-joint specimens treated with three boratrane concentrations. The half-life for boric acid controlled release for wood treated with the boratrane at a nominal 0.1% boric acid equivalent (bae) was approximately 4 years, while that for a nominal 1% bae was approximately 7 years, compared with a half-life of 10 months for conventional boric acid/borate wood treatment.

Keywords: boratrane molecular structure; hydrolysis; boric acid; bioassay; wood protection

Conference: 11-05-08/12 Queenstown, New Zealand

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