Described herein are methods of preparing cutin-derived monomers, oligomers, or combinations thereof from cutin-containing plant matter. The methods can include heating the cutin-derived plant matter in a solvent at elevated temperature and pressure. In some preferred embodiments, the methods can be carried out without the use of additional acidic or basic species.

Described herein are methods of preparing cutin-derived monomers, oligomers, or combinations thereof from cutin-containing plant matter. The methods can include heating the cutin-derived plant matter in a solvent at elevated temperature and pressure. In some preferred embodiments, the methods can be carried out without the use of additional acidic or basic species.

Described herein are methods of preparing cutin-derived monomers, oligomers, or combinations thereof from cutin-containing plant matter. The methods can include heating the cutin-derived plant matter in a solvent at elevated temperature and pressure. In some preferred embodiments, the methods can be carried out without the use of additional acidic or basic species.

Described herein are methods of preparing cutin-derived monomers, oligomers, or combinations thereof from cutin-containing plant matter. The methods can include heating the cutin-derived plant matter in a solvent at elevated temperature and pressure. In some preferred embodiments, the methods can be carried out without the use of additional acidic or basic species.

Compounds of formula I ##STR00001##
a process for preparation of compounds of formula I; precursor compounds of formula II ##STR00002##
a process for preparation of precursor compounds of formula II; compounds of formula III ##STR00003##
a process for the preparation of compounds of formula IV from compounds of formula III ##STR00004##
and the use of compounds of formula I for the preparation of compounds of formula IV.

The invention provides synthetic processes and synthetic intermediates that can be used to prepare a compound of formula (I): or a salt thereof.

The invention provides synthetic processes and synthetic intermediates that can be used to prepare a compound of formula (I): or a salt thereof.

Described herein are methods of preparing cutin-derived monomers, oligomers, or combinations thereof from cutin-containing plant matter. The methods can include heating the cutin-derived plant matter in a solvent at elevated temperature and pressure. In some preferred embodiments, the methods can be carried out without the use of additional acidic or basic species.

Described herein are methods of preparing cutin-derived monomers, oligomers, or combinations thereof from cutin-containing plant matter. The methods can include heating the cutin-derived plant matter in a solvent at elevated temperature and pressure. In some preferred embodiments, the methods can be carried out without the use of additional acidic or basic species.

A hydrogenated Diels-Alder adduct of the formula (III)

##STR00001##

a hydrogenated Diels-Alder adduct of the formula (IV)

##STR00002##

and
a lactone compound of formula (V)

##STR00003##

are disclosed and described.