Author: Peter Jernakoff
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
Book Description
The nucleophilic carbonyl complex (W(eta-C5H5)2(CO)) (1) reacts readily with the isocyanates OCNR (R = CH3, Ph) in pentane to give the first reported metallocycloimides (W(eta-C5H5)2(C(O)N(CH3)C(O))) (2) and (W(eta-C5H5)2(C(O)N(Ph)C(O))) (3). It is suggested that the reaction involves initial eta 1-C coordination of an isocyanate to give a zwitterionic intermediate in which the ligands are simultaneously activated in opposite senses, and that nucleophilic attack by the heteroallene on the electrophilic carbonyl then gives a metallocycloimide. Complex 2 has been structurally characterized by a single crystal X-ray diffraction study (monoclinic space group P2 sub 1/m, with Z = 2; a = 7.6586 A, b = 8.6718 A, c = 9.6557 A; Beta = 101.45 deg; d calc = 2.20 g/cc; R = 2.20 % and R sub w = 2.19 %) which establishes that the metallocycloimide group is essentially planar. Both 2 and 3 are moderately water sensitive, regenerating 1 at 55 C and ambient temperatures respectively. Complex 1 in toluene does not react with 1.7 atmospheres of CO2 at temperatures up to 85 C.
The Formation of Metallocycloimides from the Reaction of Isocyanates with a Neutral Transition Metal Carbonyl
Author: Peter Jernakoff
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
Book Description
The nucleophilic carbonyl complex (W(eta-C5H5)2(CO)) (1) reacts readily with the isocyanates OCNR (R = CH3, Ph) in pentane to give the first reported metallocycloimides (W(eta-C5H5)2(C(O)N(CH3)C(O))) (2) and (W(eta-C5H5)2(C(O)N(Ph)C(O))) (3). It is suggested that the reaction involves initial eta 1-C coordination of an isocyanate to give a zwitterionic intermediate in which the ligands are simultaneously activated in opposite senses, and that nucleophilic attack by the heteroallene on the electrophilic carbonyl then gives a metallocycloimide. Complex 2 has been structurally characterized by a single crystal X-ray diffraction study (monoclinic space group P2 sub 1/m, with Z = 2; a = 7.6586 A, b = 8.6718 A, c = 9.6557 A; Beta = 101.45 deg; d calc = 2.20 g/cc; R = 2.20 % and R sub w = 2.19 %) which establishes that the metallocycloimide group is essentially planar. Both 2 and 3 are moderately water sensitive, regenerating 1 at 55 C and ambient temperatures respectively. Complex 1 in toluene does not react with 1.7 atmospheres of CO2 at temperatures up to 85 C.
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
Book Description
The nucleophilic carbonyl complex (W(eta-C5H5)2(CO)) (1) reacts readily with the isocyanates OCNR (R = CH3, Ph) in pentane to give the first reported metallocycloimides (W(eta-C5H5)2(C(O)N(CH3)C(O))) (2) and (W(eta-C5H5)2(C(O)N(Ph)C(O))) (3). It is suggested that the reaction involves initial eta 1-C coordination of an isocyanate to give a zwitterionic intermediate in which the ligands are simultaneously activated in opposite senses, and that nucleophilic attack by the heteroallene on the electrophilic carbonyl then gives a metallocycloimide. Complex 2 has been structurally characterized by a single crystal X-ray diffraction study (monoclinic space group P2 sub 1/m, with Z = 2; a = 7.6586 A, b = 8.6718 A, c = 9.6557 A; Beta = 101.45 deg; d calc = 2.20 g/cc; R = 2.20 % and R sub w = 2.19 %) which establishes that the metallocycloimide group is essentially planar. Both 2 and 3 are moderately water sensitive, regenerating 1 at 55 C and ambient temperatures respectively. Complex 1 in toluene does not react with 1.7 atmospheres of CO2 at temperatures up to 85 C.
Government Reports Annual Index
Author:
Publisher:
ISBN:
Category : Research
Languages : en
Pages : 968
Book Description
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Publisher:
ISBN:
Category : Research
Languages : en
Pages : 968
Book Description
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Government Reports Announcements & Index
Government Reports Annual Index: Keyword A-L
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1164
Book Description
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1164
Book Description