Difference between revisions of "Diphenylmethanol"
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==Preparation== | ==Preparation== | ||
| − | Diphenylmethanol may be prepared by a [[Grignard reaction]] between phenylmagnesium bromide (prepared from benzyl bromide and magnesium) and [[benzaldehyde]]. | + | Diphenylmethanol may be prepared by a [[Grignard reaction]] between phenylmagnesium bromide (prepared from benzyl bromide and magnesium) and [[benzaldehyde]]. The resulting benhydrol is obtained by adding cold water/crushed ice to the reaction product.<ref>[https://www.youtube.com/watch?v=GNAfK-hKbSo Making a Secondary Alcohol Called Benzhydrol]</ref> |
| − | + | : C<sub>6</sub>H<sub>5</sub>MgBr + C<sub>6</sub>H<sub>5</sub>CHO → (C<sub>6</sub>H<sub>6</sub>)<sub>2</sub>CH-OMgBr | |
| + | : (C<sub>6</sub>H<sub>6</sub>)<sub>2</sub>CH-OMgBr + H<sub>2</sub>O → (C<sub>6</sub>H<sub>6</sub>)<sub>2</sub>CH-OH + Mg(OH)Br | ||
| − | + | Reducing [[benzophenone]] is another route. | |
| − | [[Sodium]] amalgam can also bee used. | + | : (C<sub>6</sub>H<sub>6</sub>)<sub>2</sub>C=O + 2 [H] → (C<sub>6</sub>H<sub>6</sub>)<sub>2</sub>CH-OH |
| + | |||
| + | Reducing agents used for this reaction are: | ||
| + | *[[Sodium borohydride]] | ||
| + | *[[Zinc]] dust with [[sodium hydroxide]] in [[ethanol]]<ref>http://www.orgsyn.org/demo.aspx?prep=cv1p0090</ref> | ||
| + | *[[Sodium]] amalgam can also bee used. | ||
Can also be prepared by hydrolyzing diphenhydramine. | Can also be prepared by hydrolyzing diphenhydramine. | ||
Revision as of 11:20, 9 September 2023
| Names | |
|---|---|
| IUPAC name
Diphenylmethanol
| |
| Systematic IUPAC name
Diphenylmethanol | |
| Other names
1,1-Diphenylmethanol
Benzhydrol Diphenylcarbinol Hydroxydiphenylmethane | |
| Properties | |
| C13H12O (C6H5)2CHOH | |
| Molar mass | 184.238 g/mol |
| Appearance | White solid |
| Odor | Odorless |
| Density | 1.103 g/cm3 |
| Melting point | 65–67 °C (149–153 °F; 338–340 K) |
| Boiling point | 297–298 °C (567–568 °F; 570–571 K) |
| 0.05 g/100 ml (20 °C) | |
| Solubility | Soluble in acetonitrile, chloroform, diethyl ether, ethanol, methanol |
| Solubility in ethanol | 35 g/100 ml[1] |
| Vapor pressure | 2.73·10-5 mmHg at 20 °C |
| Thermochemistry | |
| Std enthalpy of
formation (ΔfH |
-105.34 kJ/mol |
| Hazards | |
| Safety data sheet | Sigma-Aldrich |
| Flash point | 160 °C (320 °F; 433 K) |
| Lethal dose or concentration (LD, LC): | |
| LD50 (Median dose)
|
5,000 mg/kg (rat, oral) |
| Related compounds | |
| Related compounds
|
Benzyl alcohol Triphenylmethanol |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Diphenylmethanol or benzhydrol is the organic compound with the formula C13H12O.
Contents
Properties
Chemical
Diphenylmethanol can be oxidized to benzophenone.
Physical
Diphenylmethanol is a white solid, insoluble in water, but soluble in organic solvents.
Availability
Diphenylmethanol is sold by chemical suppliers.
Preparation
Diphenylmethanol may be prepared by a Grignard reaction between phenylmagnesium bromide (prepared from benzyl bromide and magnesium) and benzaldehyde. The resulting benhydrol is obtained by adding cold water/crushed ice to the reaction product.[2]
- C6H5MgBr + C6H5CHO → (C6H6)2CH-OMgBr
- (C6H6)2CH-OMgBr + H2O → (C6H6)2CH-OH + Mg(OH)Br
Reducing benzophenone is another route.
- (C6H6)2C=O + 2 [H] → (C6H6)2CH-OH
Reducing agents used for this reaction are:
- Sodium borohydride
- Zinc dust with sodium hydroxide in ethanol[3]
- Sodium amalgam can also bee used.
Can also be prepared by hydrolyzing diphenhydramine.
Projects
- Synthesis of Modafinil/Armodafinil, Adrafinil
- Synthesis of Diphenhydramine
Handling
Safety
Diphenylmethanol is an irritant to the eyes, skin and respiratory system.
Storage
In closed bottles.
Disposal
No special disposal is required as it's not very toxic.
References
- ↑ Cohen; Recueil des Travaux Chimiques des Pays-Bas; vol. 38; (1919); p. 88
- ↑ Making a Secondary Alcohol Called Benzhydrol
- ↑ http://www.orgsyn.org/demo.aspx?prep=cv1p0090
