32094-26-1

Upstream product

• 39777-47-4 10,10'-diphenyl-5,10,5',10'-tetrahydro-5,5'-oxy-bis-dibenzo[b,e]borinine 
• 100-52-7 benzaldehyde 
• 108-95-2 phenol 
• 6333-10-4 Hydroxy-phenyl-bis-(2-methoxy-phenyl)-methan 
• 100-58-3 phenylmagnesium bromide 
• 13102-33-5 2,2'-dimethoxybenzophenone 
• 54300-80-0 bis-(2-methoxy-phenyl)-phenyl-methane 

Relevant academic research and scientific papers

Access to Enantiopure Triarylmethanes and 1,1-Diarylalkanes by NHC-Catalyzed Acylative Desymmetrization

We present herein an unprecedented, efficient and enantioselective synthesis of triarylmethanes and 1,1-diarylalkanes through N-heterocyclic carbene-catalyzed acylative desymmetrization of bisphenols. This method utilizes readily available substrates, reagents and a simple procedure to deliver the valuable products in excellent enantiopurity. DFT calculations reveal that the selectivity is governed by the C?C bond cleavage step of the tetrahedral intermediate leading to the ester product. A transition state model featuring a combination of intramolecular hydrogen bond and steric effect is developed to explain the enantioselectivity.

DEVELOPER FOR THERMAL RECORDING MATERIAL AND THERMAL RECORDING MATERIALS

The developer for a thermal recording material of the present invention comprises a condensed composition consisting of, of condensates represented by the formula (1): wherein R is a hydrogen atom, a hydroxyl group, a lower alkyl group having 1 to 5 carbon atoms, an alkoxyl group having 1 to 5 carbon atoms, an aryl group or an aralkyl group, R in the number of m may be the same or different and m is an integer of 0-3, X and Y are each a hydrogen atom, an alkyl group or an aryl group, provided that at least one of X an dY is an alkyl group or an aryl group, and n is an integer of 0-3, a condensate having two cores wherein n="0 or a condensed composition comprising a condensate having two cores wherein" n=0 as a main component, and at least one kind of condensate of the formula wherein n=1-3 (3-5 core condensate). The developer for thermal recording materials of the present invention is applied to a heat-coloring layer of thermal recording materials, along with a basic dye (preferably further with a sensitizer). According to the present invention, a developer for thermal recording materials, which is capable of realizing a thermal recording material capable of affording high colored image density and superior in preservation stability (particularly heat resistance and moisture resistance) of recorded images and non-image areas, while satisfying recent requirements for high sensitivity, can be obtained.

Metal cation-exchanged montmorillonite (Mn+-mont)-catalysed aromatic alkylation with aldehydes and ketones

The alkylation of aromatic compounds with aldehydes and ketones in the presence of a variety of metal cation-exchanged montmorillonites (Mn+-mont; Mn+ = Zr4+, Al3+, Fe3+, Zn2+, H+, Na+) has been investigated. Al3+- and Zr4+-Monts are revealed to be effective as catalysts, while no reaction takes place with Na+-mont. Al3+-Mont-catalysed alkylation of phenol with several aldehydes produces mainly or almost solely the corresponding gem-bis(hydroxyphenyl)alkanes (bisphenols) in good yields, while that with several ketones affords selectively the corresponding alkylphenols in moderate to good yields. The alkylation always occurs at the carbonyl carbon without any skeletal rearrangement and the kind of products depends much on the steric hindrance of an electrophilic intermediary carbocation. The alkylation of anisole, veratrole and p-cresol proceeds well, while that of toluene, benzene, chlorobenzene and nitrobenzene scarcely occurs.