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CAS

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28445-29-6

Tris(4-methoxyphenyl)borane, also known as TMPB, is an organoborane compound with the chemical formula C18H21BO3. It is a colorless, crystalline solid that is soluble in organic solvents. TMPB is widely used as a reducing agent in organic synthesis, particularly for the reduction of carbonyl compounds to alcohols. It is known for its mild reducing properties and selectivity, making it a valuable reagent in the preparation of various organic compounds. The compound is also recognized for its stability and ease of handling compared to other borane reducing agents. TMPB is prepared by the reaction of borane with 4-methoxyphenylmagnesium bromide, and its structure features a boron atom bonded to three 4-methoxyphenyl groups.

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  • 28445-29-6 Structure

  • Basic information

    1. Product Name: tris(4-methoxyphenyl)borane
    2. Synonyms: tris(4-methoxyphenyl)borane
    3. CAS NO:28445-29-6
    4. Molecular Formula:
    5. Molecular Weight: 332.207
    6. EINECS: N/A
    7. Product Categories: N/A
    8. Mol File: 28445-29-6.mol

  • Chemical Properties

    1. Melting Point: N/A
    2. Boiling Point: N/A
    3. Flash Point: N/A
    4. Appearance: N/A
    5. Density: N/A
    6. Refractive Index: N/A
    7. Storage Temp.: N/A
    8. Solubility: N/A
    9. CAS DataBase Reference: tris(4-methoxyphenyl)borane(CAS DataBase Reference)
    10. NIST Chemistry Reference: tris(4-methoxyphenyl)borane(28445-29-6)
    11. EPA Substance Registry System: tris(4-methoxyphenyl)borane(28445-29-6)

  • Safety Data

    1. Hazard Codes: N/A
    2. Statements: N/A
    3. Safety Statements: N/A
    4. WGK Germany:
    5. RTECS:
    6. HazardClass: N/A
    7. PackingGroup: N/A
    8. Hazardous Substances Data: 28445-29-6(Hazardous Substances Data)

28445-29-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 28445-29-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,4,4 and 5 respectively; the second part has 2 digits, 2 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 28445-29:
(7*2)+(6*8)+(5*4)+(4*4)+(3*5)+(2*2)+(1*9)=126
126 % 10 = 6
So 28445-29-6 is a valid CAS Registry Number.

28445-29-6Relevant articles and documents

Lewis Acidic Boranes, Lewis Bases, and Equilibrium Constants: A Reliable Scaffold for a Quantitative Lewis Acidity/Basicity Scale

Mayer, Robert J.,Hampel, Nathalie,Ofial, Armin R.

supporting information, p. 4070 - 4080 (2021/01/29)

A quantitative Lewis acidity/basicity scale toward boron-centered Lewis acids has been developed based on a set of 90 experimental equilibrium constants for the reactions of triarylboranes with various O-, N-, S-, and P-centered Lewis bases in dichloromethane at 20 °C. Analysis with the linear free energy relationship log KB=LAB+LBB allows equilibrium constants, KB, to be calculated for any type of borane/Lewis base combination through the sum of two descriptors, one for Lewis acidity (LAB) and one for Lewis basicity (LBB). The resulting Lewis acidity/basicity scale is independent of fixed reference acids/bases and valid for various types of trivalent boron-centered Lewis acids. It is demonstrated that the newly developed Lewis acidity/basicity scale is easily extendable through linear relationships with quantum-chemically calculated or common physical–organic descriptors and known thermodynamic data (ΔH (Formula presented.)). Furthermore, this experimental platform can be utilized for the rational development of borane-catalyzed reactions.

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