186707-01-7

Upstream product

• 186706-95-6 Acetic acid 1-acetoxy-12-tert-butyl-7-[5-tert-butyl-2-(dimethoxy-phosphorylmethyl)-3-methyl-phenyl]-10-methyl-7b-oxo-7bH,9H-8-oxa-7bλ⁵-phospha-benzo[6,7]cyclohepta[1,2,3-jk]fluoren-6-yl ester 
• 186706-97-8 [4-tert-Butyl-2-(12-tert-butyl-1,6-dihydroxy-10-methyl-7b-oxo-7bH,9H-8-oxa-7bλ⁵-phospha-benzo[6,7]cyclohepta[1,2,3-jk]fluoren-7-yl)-6-methyl-benzyl]-phosphonic acid dimethyl ester 
• 186706-99-0 {4-tert-Butyl-2-[12-tert-butyl-1,6-bis-(diethoxy-phosphorylmethoxy)-10-methyl-7b-oxo-7bH,9H-8-oxa-7bλ⁵-phospha-benzo[6,7]cyclohepta[1,2,3-jk]fluoren-7-yl]-6-methyl-benzyl}-phosphonic acid dimethyl ester 

Relevant academic research and scientific papers

Synthesis of substituted dibenzophospholes. Part 9. Preparation of two water-soluble phosphinic-polyphosphonic acids

Several improvements, including a generally applicable method for reduction of aromatic nitro compounds to amines, were made to the preparation from 2,2′,4,4′-tetranitrobiphenyl of the meso atropisomer 1 of a bis-phosphonomethylated 4,6-diaryldibenzophosphole 5-oxide, previously obtained in impure form.2 A concomitant product 12 containing one phosphonomethyl group was formed by a novel intramolecular displacement. Both products were converted by a specially developed method3 into crystalline phosphinic-polyphosphonic acids, containing respectively four and three phosphonomethyl groups, which formed stable monodisperse solutions in water at pH 2-4. These solutions catalysed the hydration of 2-methylpropene to fert-butyl alcohol somewhat more efficiently than a toluene-4-sulfonic acid solution of equivalent acidity.