Initiators of the Type Mo(NAr)(CHR’)(OR”)2 for the Controlled Polymerization of Diethyldipropargylmalonate was written by Adamchuk, Jennifer;Schrock, Richard R.;Tonzetich, Zachary J.;Mueller, Peter. And the article was included in Organometallics in 2006.Electric Literature of C10H14O4 This article mentions the following:
Molybdenum arylimido carbene dialkoxide complexes were prepared by alkoxide and carbene substitution reactions; the prepared complexes were tested in oligomerization of di-Et dipropargylmalonate into cyclopentene-ethylene conjugated oligomers. The reaction between carbene molybdenum alcoholate [Mo(NAr)(trans-CHCH:CHMe)[OCMe(CF3)2]2(quin)] (Ar = 2,6-iPr2C6H3; quin = quinuclidine) and lithium tert-butoxide yields [Mo(NAr)(trans-CHCH:CHMe)(OtBu)2(quin)] (1). The achiral,syn isomer could be isolated and was shown in an x-ray study to be a trigonal bipyramid in which quinuclidine is coordinated trans to a syn-butenylidene carbene ligand. A base-free species (2) that contains a five-membered ring as part of a trienylidene unit could be obtained by treating Mo(NAr)(CHCMe2R)[OCMe(CF3)2]2 (R = Me, Ph) with di-Et 3-isobutenyl-4-vinylcyclopent-3-ene-1,1-dicarboxylate (B) in pentane. The tert-butoxide analog of 2 (3) was obtained straightforwardly and was shown in an x-ray study to be the syn-alkylidene isomer. The reaction between 3-vinyl-3-cyclohexene-1,1-dicarboxylate and Mo(NAr)(CHCMe3)[OCMe(CF3)2]2 gave Mo(NAr)[(5,5-bis(ethoxycarbonyl)-3-cyclohexen-1-yl)methylene][OCMe(CF3)2]2 (5a),which could be treated with LiO-t-Bu to yield an analogous tert-butoxide species (5b). An x-ray structure of a sample of 5b that retained 2 equiv of LiOCMe(CF3)2 showed it to be a dimeric species in which two Mo complexes were joined through a Li4O4 heterocubane-type structure binding to one ester oxygen in each of the Mo species. Reactions between di-Et dipropargylmalonate (DEDPM) and tert-butoxides 1, 3, or 5b yielded in oligomers containing cyclopentene rings conjugated by ethenediyl bridges; kp/ki values being less than 1. All reactions can be followed by proton NMR spectra of the alkylidene proton region, and all appear to be living polymerizations under the conditions employed. A Wittig-like reaction between di-Et 3-formyl-4-(2-methyl-2-propenyl)cyclopent-3-ene-1,1-dicarboxylate (A) and 2 yielded a sym. pentaene I (C, n = 1) as an ivory-colored solid. The heptene I (D, n = 2) and the nonene I (E, n = 2) could be isolated from reactions between 1 equiv of DEDPM and 3 in CH2Cl2 in the presence of 1 equiv of quinuclidine at -30° followed by quenching with aldehyde A. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Electric Literature of C10H14O4).
Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Electric Literature of C10H14O4
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics