A method for retarding an ethylene response in a plant or plant part comprising the step of contacting the plant or plant part with an ethylene response retarding amount of benzocyclopropene and/or naphtho[b]cyclopropane.

Disclosed is a cyclopropanation process comprising the step of reacting an alkene compound having at least one carbon-carbon double bond with at least one dihaloalkane. The reaction is carried out in the presence of (i) particulate metal Zn, (ii) catalytically effective amount of particulate metal Cu or a salt thereof, (iii) at least one haloalkylsilane, and (iv) at least one solvent.

Disclosed is a cyclopropanation process comprising the step of reacting an alkene compound having at least one carbon-carbon double bond with at least one dihaloalkane. The reaction is carried out in the presence of (i) particulate metal Zn, (ii) catalytically effective amount of particulate metal Cu or a salt thereof, (iii) at least one haloalkylsilane, and (iv) at least one solvent.

The present invention relates to methods and compositions for olefin metathesis. More particularly, the present invention relates to methods and compositions for ring opening metathesis polymerization (ROMP) reactions and the manufacture of polymer articles and/or polymer composite articles via ROMP Polymer products produced via the metathesis reactions of the invention may be utilized in a wide range of materials and composite applications. The invention has utility in the fields of polymer and materials chemistry and manufacture.

The present invention relates to methods and compositions for olefin metathesis. More particularly, the present invention relates to methods and compositions for ring opening metathesis polymerization (ROMP) reactions and the manufacture of polymer articles and/or polymer composite articles via ROMP Polymer products produced via the metathesis reactions of the invention may be utilized in a wide range of materials and composite applications. The invention has utility in the fields of polymer and materials chemistry and manufacture.

A ligand of formula (I) ##STR00001## wherein L is a divalent bridge selected from R.sub.2C, R.sub.2CCR.sub.2, R.sub.2Si, R.sub.2SiSiR.sub.2, R.sub.2Ge, wherein each R is independently a hydrogen atom, C.sub.1-20-hydrocarbyl, tri(C.sub.1-20-alkyl)silyl, C.sub.6-20-aryl, C.sub.7-20-arylalkyl or C.sub.7-20-alkylaryl; R.sup.2 and R.sup.2 are each independently a C.sub.1-20 hydrocarbyl radical; R.sup.5 is a C.sub.1-20 hydrocarbyl group; R.sup.6, R.sup.6, R.sup.7 and R.sup.7 are each independently hydrogen or a C.sub.1-20 hydrocarbyl group; Ar and Ar are independently an aryl or heteroaryl group having up to 20 carbon atoms; each R.sup.1 is a C.sub.1-20 hydrocarbyl group or two R.sup.1 groups on adjacent carbon atoms taken together can form a fused 5 or 6 membered non aromatic ring with the Ar group; and each R.sup.4 is a C.sub.1-20 hydrocarbyl group; and the dotted lines represent a double bond present in between carbons 1 and 2 or 2 and 3 of the indenyl ring.

A ligand of formula (I) ##STR00001## wherein L is a divalent bridge selected from R.sub.2C, R.sub.2CCR.sub.2, R.sub.2Si, R.sub.2SiSiR.sub.2, R.sub.2Ge, wherein each R is independently a hydrogen atom, C.sub.1-20-hydrocarbyl, tri(C.sub.1-20-alkyl)silyl, C.sub.6-20-aryl, C.sub.7-20-arylalkyl or C.sub.7-20-alkylaryl; R.sup.2 and R.sup.2 are each independently a C.sub.1-20 hydrocarbyl radical; R.sup.5 is a C.sub.1-20 hydrocarbyl group; R.sup.6, R.sup.6, R.sup.7 and R.sup.7 are each independently hydrogen or a C.sub.1-20 hydrocarbyl group; Ar and Ar are independently an aryl or heteroaryl group having up to 20 carbon atoms; each R.sup.1 is a C.sub.1-20 hydrocarbyl group or two R.sup.1 groups on adjacent carbon atoms taken together can form a fused 5 or 6 membered non aromatic ring with the Ar group; and each R.sup.4 is a C.sub.1-20 hydrocarbyl group; and the dotted lines represent a double bond present in between carbons 1 and 2 or 2 and 3 of the indenyl ring.

A heterophasic polypropylene resin comprising a polypropylene homopolymer matrix phase (A) and an ethylene-propylene copolymer phase (B) dispersed within the matrix, wherein the xylene soluble fraction of the heterophasic polypropylene resin is in the range 20 to less than 50 wt %; the heterophasic polypropylene resin has an MFR2 of 0.01 to 50 g/10 min; the ethylene content of the xylene soluble fraction of the heterophasic polypropylene resin is in the range of at least 20 wt % to less than 50 wt %; the heterophasic polypropylene resin has a notched charpy impact strength at 20 C of at least 25 kJ/m.sup.2, preferably at least 50 kJ/m.sup.2; and wherein the MFR.sub.2 (Matrix)/MFR.sub.2(XS)5, preferably 10.