Coniferyl alcohol

Coniferyl alcohol is a colourless crystalline organic compound. One of the monolignols, it is a phytochemical synthesized via the phenylpropanoid biochemical pathway. When copolymerized with related aromatic compounds, coniferyl alcohol forms lignin or lignans.[1] Coniferin is a glucoside of coniferyl alcohol.

Coniferyl alcohol

Names
IUPAC name 4-[(E)-3-hydroxyprop-1-enyl]-2-methoxyphenol
Other names 4-hydroxy-3-methoxycinnamyl alcohol Coniferol
Identifiers
CAS Number	32811-40-8
3D model (JSmol)	Interactive image
Beilstein Reference	2048963
ChEBI	CHEBI:17745
ChEMBL	ChEMBL501870
ChemSpider	1266063
ECHA InfoCard	100.260.977
EC Number	207-277-9
KEGG	C00590
PubChem CID	1549095
UNII	E7SM92591P
CompTox Dashboard (EPA)	DTXSID50186489
InChI InChI=1S/C10H12O3/c1-13-10-7-8(3-2-6-11)4-5-9(10)12/h2-5,7,11-12H,6H2,1H3/b3-2+ Key: JMFRWRFFLBVWSI-NSCUHMNNSA-N InChI=1/C10H12O3/c1-13-10-7-8(3-2-6-11)4-5-9(10)12/h2-5,7,11-12H,6H2,1H3/b3-2+ Key: JMFRWRFFLBVWSI-NSCUHMNNBF
SMILES Oc1ccc(cc1OC)/C=C/CO
Properties
Chemical formula	C10H12O3
Molar mass	180.203 g·mol^−1
Melting point	74 °C (165 °F; 347 K)
Boiling point	163 to 165 °C (325 to 329 °F; 436 to 438 K)
Hazards
GHS pictograms
GHS Signal word	Warning
GHS hazard statements	H315, H319, H335
GHS precautionary statements	P261, P264, P271, P280, P302+352, P304+340, P305+351+338, P312, P321, P332+313, P337+313, P362, P403+233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Coniferyl alcohol is an intermediate in biosynthesis of eugenol and of stilbenoids and coumarin. Gum benzoin contains significant amount of coniferyl alcohol and its esters.

It is found in both gymnosperm and angiosperm plants. Sinapyl alcohol and paracoumaryl alcohol, the other two lignin monomers, are found in angiosperm plants and grasses.

It is a queen retinue pheromone (QRP), a type of honey bee pheromone found in the mandibular glands.[2]

Pinoresinol biosynthesis

A first dirigent protein was discovered in Forsythia intermedia. This protein has been found to direct the stereoselective biosynthesis of (+)-pinoresinol from coniferyl alcohol monomers.[3] Recently, a second, enantiocomplementary dirigent protein was identified in Arabidopsis thaliana, which directs enantioselective synthesis of (−)-pinoresinol.[4]

References

1. Iiyama, Kenji; Lam, Thi Bach-Tuyet; Stone, Bruce A. (1994). "Covalent Cross-Links in the Cell Wall". Plant Physiology. 104 (2): 315–320. doi:10.1104/pp.104.2.315. PMC 159201. PMID 12232082.
2. Keeling, C. I.; Slessor, K. N.; Higo, H. A.; Winston, M. L. (2003). "Isolation and identification of new components of the honey bee (Apis mellifera L.) queen retinue pheromone". Proc. Natl. Acad. Sci. U.S.A. 100 (8): 4486–4491. doi:10.1073/pnas.0836984100. PMC 153582. PMID 12676987.
3. Davin, L. B.; Wang, H. B.; Crowell, A. L.; et al. (1997). "Stereoselective bimolecular phenoxy radical coupling by an auxiliary (dirigent) protein without an active center". Science. 275 (5298): 362–366. doi:10.1126/science.275.5298.362. PMID 8994027.
4. Pickel, B.; Constantin, M.-A.; Pfannsteil, J.; Conrad, J.; Beifuss, U.; Schaffer, A. (March 2007). "An Enantiocomplementary Dirigent Protein for the Enantioselective Laccase-Catalyzed Oxidative Coupling of Phenols". Angewandte Chemie. 53 (4): 273–284. doi:10.1007/s10086-007-0892-x.