@article {43052,
	title = {Impact of modular substitution on crystal packing: the tale of two ureas},
	journal = {CrystEngComm},
	volume = {18},
	year = {2016},
	month = {AUG},
	pages = { 7078-7094},
	doi = {10.1039/C6CE01324D},
	author = {Koshti, Vijay S. and Thorat, Shridhar H. and Gote, Ravindra P. and Chikkali, Samir H. and Gonnade, Rajesh G.}
}
@article {45362,
	title = {Accelerated and enantioselective synthesis of a library of p-stereogenic urea phosphines},
	journal = {European Journal Of Organic Chemistry},
	year = {2018},
	month = {DEC},
	pages = {6768-6779},
	type = {Article},
	abstract = {Chiral phosphorus ligands play a central role in majority of the asymmetric transformations. However, access to chiral phosphorus ligands is limited due to their challenging synthesis. Reported here is a highly efficient and accelerated catalytic asymmetric synthesis of P-stereogenic urea containing phosphines leading to a small library of 18 chiral phosphorus compounds. Characteristic two doublets in a P-31 NMR spectrum, spectroscopic and analytical evidences authenticated the formation of [Pd-{(S,S) Me-FerroLANE}(m-phenylurea)(I)] complex. Indeed, [Pd-{(S,S) Me-FerroLANE}(m-phenylurea)(I)] was found to catalyze the C-P coupling reaction and quantitative conversion was observed within 18 hours. Under optimized conditions, iodophenyl urea{\textquoteright}s (2a-2j) were treated with secondary phosphines (1a-1c) in presence of [Pd-{(S,S) Me-FerroLANE}(m-phenylurea)(I)] to obtain P-stereogenic urea phosphines 5a-5r. The identity of these urea derived phosphines was unambiguously ascertained using a combination of spectroscopic and analytical methods. The catalyst tolerated various functional groups and yielded corresponding urea containing phosphines with an enantiomeric excess in the range of 15-62 \%.},
	issn = { 1434-193X},
	doi = {10.1002/ejoc.201801309},
	author = {Koshti, Vijay S. and Gote, Ravindra P. and Chikkali, Samir H.}
}
@article {44589,
	title = {Judicious reduction of supported Ti catalyst enables access to disentangled ultrahigh molecular weight polyethylene},
	journal = {Macromolecules},
	volume = {51},
	year = {2018},
	month = {JUN },
	pages = {4541-4552},
	abstract = {<p>Heterogeneous Ziegler-Natta and homogeneous metallocene catalysts are known to produce ultrahigh molecular weight polyethylene (UHMWPE) in the entangled state. On the other hand, only (two) homogeneous single-site catalysts are reported to yield disentangled UHMWPE (dis-UHMWPE). This disparity between the two types of catalysts and the two states of polyethylene can be bridged if a heterogeneous single-site catalyst that can yield dis-UHMWPE is made accessible. Here, one-pot two-step synthesis of a MgCl2 supported [Ti(OEt)(4)] derived catalyst 1 with a two-stage activation strategy is reported to produce dis-UHMWPE. Second activation of catalyst 1 was performed by adding excess modified methylaluminoxane (MMAO12), and XPS analysis indicated that the catalyst existed in only Ti(III) state at [A1]/[Ti] ratio of 600. Catalyst 1 after second activation with MMAO12 was found to be highly active in ethylene polymerization and produced dis-UHMWPE. Polymerization conditions were tailored to obtain molecular weight (M-w) as high as 13 million g/mol PE. To the best of our knowledge, this is the first time a heterogeneous catalyst (catalyst 1) that displays pseudosingle site nature is able to produce dis-UHMWPE. The thus-prepared nascent polyethylene revealed a melting temperature of 141-144 degrees C, which is a characteristic melting transition for a dis-UHMVVPE. The disentangled state of the nascent PE and its M-w and MVVD were further authenticated by rheological investigations. Isothermal time, sweep oscillatory experiments in linear viscoelastic limit revealed a rapid rise in elastic modulus followed by equilibration to plateau modulus, which are characteristic features of the disentangled state. Thus, a pseudo-singlesite heterogeneous catalyst has been accessed, which upon second activation with excess MMAO12 led to the production of dis-UHMWPE.</p>},
	issn = {0024-9297},
	doi = {10.1021/acs.macromol.8b00590},
	author = {Gote, Ravindra P. and Mandal, Dipa and Patel, Ketan and Chaudhuri, Krishnaroop and Vinod, C. P. and Lele, Ashish K. and Chikkali, Samir H.}
}
