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Your search keyword '"Pavel Hrnčiar"' showing total 2 results
Start Over Author "Pavel Hrnčiar" Publisher elsevier bv
2 results on '"Pavel Hrnčiar"'

1. All trees of diameter five are graceful

Author

Pavel Hrnčiar and Alfonz Haviar

Subjects
Combinatorics, Discrete mathematics, Tree (data structure), Graceful labeling, Discrete Mathematics and Combinatorics, Graceful labelling, Tree, Mathematics, Theoretical Computer Science
Abstract

In the paper it is shown that every tree with diameter 5 is graceful.

Published
2001
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2. Cyclic β-diketones — precursors of chiral 1,3-cyclohexadiene iron carbonyl complexes. Ligand exchange — (−)-PPh2 (OHC∗(Me)-COOEt) — new, chiral, diastereomer-separating ligand in organoiron chemistry

Author

Andrej Boháč, Martina Lettrichová, Milan Hutta, and Pavel Hrnčiar

Subjects
Phosphinite, Stereochemistry, Ligand, Organic Chemistry, Chiral ligand, Diastereomer, Biochemistry, Medicinal chemistry, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Dimedone, Materials Chemistry, Organoiron chemistry, Physical and Theoretical Chemistry, Chirality (chemistry), Phosphine
Abstract

A synthesis of new, chiral tricarbonyliron complexes (1, 2) from 1,3-cyclohexanedione and 5,5-dimethyl-1,3-cyclohexanedione (dimedone) after their conversion to 1,3-diacetoxy-1,3-cyclohexadienes and complexation with Fe2(CO)9 is described. Ligand-exchange reactions of complexes 1,2 with PPh3 (A), (−)-P(OHC)∗(Me)-COOEt)3 ‘(−)-TEOCEOP’ (B) and and (−)-PPh2(OHC∗(Me)-COOEt) ‘LACTODIPPHOS’ (C) were accomplished in good yield. A new prospective chiral ligand for organoiron chemistry, derived from commercially available (S)-(−)-ethyl lactate, (−)-PPh2(OHC∗(Me)-COOEt) (C) was found. By means of ligand C, a diastereoisomeric mixture of the (1,3-diacetoxy-1,3-cyclohexadiene)Fe(Co)2PPh2(OHC∗(Me)-COOet) complex 1C (IC120 and1C160) was successfully separated.

Published
1996
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