39787-30-9

Basic information

• Product Name: 1,2-diphenyl-1,1,2,2-tetramethoxyethane
• Synonyms: 1,2-diphenyl-1,1,2,2-tetramethoxyethane
• CAS NO: 39787-30-9
• Molecular Weight: 302.37
• Mol File: 39787-30-9.mol
• Article Data: 4

Chemical Properties

• CAS DataBase Reference: 1,2-diphenyl-1,1,2,2-tetramethoxyethane(CAS DataBase Reference)
• NIST Chemistry Reference: 1,2-diphenyl-1,1,2,2-tetramethoxyethane(39787-30-9)
• EPA Substance Registry System: 1,2-diphenyl-1,1,2,2-tetramethoxyethane(39787-30-9)

Safety Data

• Hazardous Substances Data: 39787-30-9(Hazardous Substances Data)

Upstream product

• 24650-42-8 2,2-dimethoxy-2-phenylacetophenone 
• 67-56-1 methanol 
• 30928-28-0 α,β-dimethoxystilbene 
• 501-65-5 diphenyl acetylene 

Downstream Products

• 66822-20-6 α,α'-dimethoxybenzyl radical 

Relevant articles and documents

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Geminal Substituent Effects. VIII. Enthalpies of Formation od Acetals

The standard enthalpies of combustion ΔHoc(1 or c) of the α-phenyl-substituted acetals (1) and diacetals (2) were measured calorimetrically.The enthalpies of vaporisation or sublimation ΔHvap or ΔHsub of 1-2 were obtained from the temperature function of the vapor pressure measured in a flow system, and the standard enthalpies of formation are obtained thereof: ΔH0f (l or c) and ΔHof (g) (in kJ mol-1 for 1a= -308.40+/-0.52(1), -248.94+/-0.88; 1b= -343.48+/-0.72(1), -288.5+/-1.5; 1c= -267.4+/-1.3(1), -205.3+/-1.3; 1d = -343.8+/-2.1 (c), -261.9+/-2.2; 1e = -397.02+/-0.86 ( c), -311.3+/-1.2; 1f = -414.52+/-0.80 (1), -350.68+/-0.86; 2a = -564.8+/-2.4 (c), -467.1+/-2.5; 2b = -547.6+/-1.6 (c), -414.9+/-2.7; 2c = -717.1+/-7.5 (c), -587.0+/-8.0.The results are combined into values of two strain free group increments CHPh> = -59.7 and CPh, C> = -71.3 kJ mol-1; and compared to the aliphatic series of acetals.

Oxidation of Diphenylacetylene by I7+ and I5+ Compounds

The oxidation of diphenylacetylene with H5IO6 in acetic acid affords benzil.In methanol the principal products are the monoketal and the diketal of benzil, depending upon water content.Similar products are formed in methanol when I2O5 is the oxidizing agent.The latter and the alkyne in ethylene glycol afford benzil and the corresponding diketal.Both systems appear to require the presence of iodine for effective action.