137072-81-2

Basic information

• Product Name: 3H-Cyclobuta[b]phosphindole, 2a,7b-dihydro-3-phenyl-, 3-oxide
• CAS NO: 137072-81-2
• Molecular Formula: C16H13OP
• Molecular Weight: 252.252
• Mol File: 137072-81-2.mol

Chemical Properties

• CAS DataBase Reference: 3H-Cyclobuta[b]phosphindole, 2a,7b-dihydro-3-phenyl-, 3-oxide(CAS DataBase Reference)
• NIST Chemistry Reference: 3H-Cyclobuta[b]phosphindole, 2a,7b-dihydro-3-phenyl-, 3-oxide(137072-81-2)
• EPA Substance Registry System: 3H-Cyclobuta[b]phosphindole, 2a,7b-dihydro-3-phenyl-, 3-oxide(137072-81-2)

Safety Data

• Hazardous Substances Data: 137072-81-2(Hazardous Substances Data)

Upstream product

• 137072-80-1 7-Oxo-7-phenyl-2,2a,7,7a-tetrahydro-1H-7λ⁵-phospha-cyclobuta[a]indene-2-carboxylic acid 

Downstream Products

• 91-20-3 naphthalene 
• 137072-82-3 1-phenyl-1-benzophosphepine 1-oxide 

Relevant articles and documents

Studies on seven-membered heterocycles. XXXIV. Syntheses and reactions of 1-benzosilepines, 1-benzogermepines, 1-benzophosphepines, and 1-benzarsepines

Flash vacuum pyrolysis of 2a,7b-dihydrocyclobuta[b]-1-benzometalloles (6a-e), prepared from the corresponding 1-benzometalloles (3) containing Si, Ge, P, or As via three steps, resulted in valence isomerization with ring-opening to give 1,1-dimethyl-1-benzosilepine (7a), 1-methyl-1-phenyl-1-benzosilepine (7b), 1,1-dimethyl-1-benzogermepine (7c), 1-phenyl-1-benzophosphepine 1-oxide (7d), and 1-phenyl-1-benzarsepine 1-oxide (7e). The oxides (7d,e), on treatment with trichlorosilane, underwent deoxygenation to afford 1-phenyl-1-benzophosphepine (7f) and 1-phenyl-1-benzarsepine (7g). The 1-benzometallepines (7a-g) thus obtained are hitherto unknown heterocyclic ring compounds, and their thermal stabilities and several reactions were examined.

Synthesis of the First Examples of 1-Benzophosphepines

Flash vacuum pyrolysis of 2a,7b-dihydro-3-phenyl-3H-cyclobutphosphindole 3-oxide 4, prepared from 1-phenyl-1H-phosphindole 1-oxide 1 via tree steps, results in ring-opening to give 1-phenyl-1-benzophosphepine 1-oxide 5, which, on treatment with trichlorosilane, undergoes deoxygenation to afford 1-phenyl-1-benzophosphepine 6.