4-Imino-4,5-dihydro-1,2.lambda.6-3-oxathiazol-2-ones. Ring-opening cycloaddition reactions with maintenance of the ring size

1979 ◽  
Vol 44 (22) ◽  
pp. 3991-3994 ◽  
Author(s):  
Gerrit L'abbe ◽  
Chih-Chou Yu ◽  
Suzanne Toppet
Keyword(s):  
Ring Opening ◽  
Ring Size ◽  
Cycloaddition Reactions

Cycloaddition reactions. Addition of dimethyl acetylenedicarboxylate to 1-dimethylaminoindene

1970 ◽  
Vol 48 (11) ◽  
pp. 1633-1638 ◽  
Author(s):  
Terrence W. Doyle
Keyword(s):  
Ring Opening ◽  
Cycloaddition Reactions ◽  
Dimethyl Acetylenedicarboxylate ◽  
Reaction Conditions

The cycloaddition of 1-dimethylaminoindene (2) to dimethyl acetylenedicarboxylate to form a fused cyclobutene system 3 is discussed. Compound 3 underwent two modes of ring opening to yield either the indene–maleate system 4 or the benzocycloheptatriene system 5 depending on reaction conditions. The synthesis of a number of multifunctional benzotropones from 5 is discussed.

DABCO as a Base and an Organocatalyst in Organic Synthesis: A Review

2020 ◽  
Vol 7 (2) ◽  
pp. 146-162
Author(s):  
Dinesh K. Jangid
Keyword(s):  
Organic Synthesis ◽  
Ring Opening ◽  
High Selectivity ◽  
Solid Catalyst ◽  
Cycloaddition Reactions ◽  
Coupling Reactions ◽  
Henry Reaction ◽  
Environmental Friendly ◽  
Ring Opening Reactions ◽  
Catalytic Applications

One of the organocatalysts 1,4-diazabicyclo[2.2.2]octane (DABCO) is an excellent solid catalyst in a number of reactions. It is also a good nucleophile and a base in numerous reactions for the synthesis of heterocycles. DABCO catalyzes many reactions like cycloaddition reactions, coupling reactions, Baylis-Hillman reaction, Henry reaction, ring opening reactions, etc. One more advanced feature of these reactions is that they proceed through environmental friendly pathway. DABCO has more advantages than other organic catalysts because it is an inexpensive, non.toxic base, an ecofriendly and a highly reactive catalyst for building of organic frameworks, which produce the desired products in excellent yields with high selectivity. Many catalytic applications of DABCO have been reported for the synthesis of an organic framework which has been discussed in this review.

Ring-opening polymerization of ω-6-hexadecenlactone by a salicylaldiminato aluminum complex: a route to semicrystalline and functional poly(ester)s

2015 ◽  
Vol 6 (10) ◽  
pp. 1727-1740 ◽  
Author(s):  
Tiziana Fuoco ◽  
Angelo Meduri ◽  
Marina Lamberti ◽  
Vincenzo Venditto ◽  
Claudio Pellecchia ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Ring Size ◽  
Aluminum Complex ◽  
Large Ring

The homo and co-polymerization of a large ring size lactone afforded unsaturated poly(esters), further modified to functional thermoplastic materials.

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