Methods described herein relate to a partial reduction of esters to aldehydes or nitrogen-containing products facilitated by Group IV transition metal catalysts, using hydrosilanes as the reductant. The method allows the product to be preserved at the aldehyde oxidation level rather than over-reduction to the corresponding alcohol and can result in the formation of value-added recycled monomers. Methods described herein can be used for the direct catalytic chemical upcycling of polyester plastic waste through depolymerization transformations.

Methods described herein relate to a partial reduction of esters to aldehydes or nitrogen-containing products facilitated by Group IV transition metal catalysts, using hydrosilanes as the reductant. The method allows the product to be preserved at the aldehyde oxidation level rather than over-reduction to the corresponding alcohol and can result in the formation of value-added recycled monomers. Methods described herein can be used for the direct catalytic chemical upcycling of polyester plastic waste through depolymerization transformations.

Disclosed are processes for the preparation of the pesticide N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide. Also disclosed are methods for the preparation of intermediates of thereof N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide.

Disclosed are processes for the preparation of the pesticide N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide. Also disclosed are methods for the preparation of intermediates of thereof N-(1-methylcyclopropyl)-2-(3-pyridinyl)-2H-indazole 4-carboxamide.