Delivery systems for cyclopropenes

A composition comprising:

• a) a compound of the formula:
• wherein:
• 1) each R1, R2, R3, and R4 is independently a group of the formula:
• —(L)n—Z
• wherein:
• i) n is an integer from 0 to 12;
• ii) each L is independently selected from a member of the group D, E, or J wherein:
• D is of the formula:
• E is of the formula:
• J is of the formula:
• wherein:
• A) each X and Y is independently a group of the formula:
• —(L)m—Z;
• and
• B) m is an integer from 0 to 8;
• and
• C) no more than two E groups are adjacent to each other and no J groups are adjacent to each other;
• iii) each Z is independently selected from:
• A) hydrogen, halo, cyano, nitro, nitroso, azido, chlorate, bromate, iodate, isocyanato, isocyanido, isothiocyanato, pentafluorothio, or
• B) a group G, wherein G is an unsubstituted or substituted;
• unsaturated, partially saturated, or saturated;
• monocyclic, bicyclic, tricyclic, or fused;
• carbocyclic or heterocyclic ring system wherein;
• 1) when the ring system contains a 3 or 4 membered heterocyclic ring, the heterocyclic ring contains 1 heteroatom;
• 2) when the ring system contains a 5, or more, membered heterocyclic ring or a polycyclic heterocyclic ring, the heterocyclic or polycyclic heterocyclic ring contains from 1 to 4 heteroatoms;
• 3) each heteroatom is independently selected from N, O, and S;
• 4) the number of substituents is from 0 to 5 and each substituent is independently selected from X;
• 2) the total number of non-hydrogen atoms in each compound is 50 or less;
• and
• its enantiomers, stereoisomers, salts, and mixtures thereof;
• and
• b) a packaging material.