1. These, cycloaddition reactions proceed with stereoselectivity.

2. The cycloaddition itself is the slow step.

3. In most cases, 1,3-dipolar cycloaddition of azides with acetylenes is the only way to synthesize substituted 1,2,3-triazoles.

4. The studies indicate that 1,3-dipolar cycloaddition reactions are concerted reactions.

5. This paper introduce 1, 3-dipolar cycloaddition as a type of reaction, and also mentioned several disputed mechanisms and arguments: R.

6. Asymmetric 1, 3 - dipolar cycloaddition can be strongly catalyzed by chiral oxazaborolidines.

7. The reaction mechanism of 4-methyl-5-ethenyl-heptanitril e oxide cycloaddition is studied with the molecular orbital AM1 method and transit ion state theory.

8. This paper focuses on the cycloaddition reactions on solid phase supports and their applications in organic synthesis and mechanism research.

9. The reaction mechanism of 8-dimethyl-7-methoxy-5-ethenyl-nonanenitrile oxide cycloaddition has been studied with the molecular orbital AM1 method and transition state theory.

9.

10. At last, the catalytic mechanism of cycloaddition of propylene oxide with carbon dioxide is discussed.

11. The cycloaddition reaction of dichlorocarbene with C60 has been studied by using the semi-empirical method AM1. A reasonable mechanism of the reaction has been suggested.

12. The 1,3-dipolar cycloaddition reaction is very important in the synthese of the organic and functional molecule, and it is significant to ravel its reaction mechanism.

13. In this paper, the catalysts and reaction conditions of the cycloaddition of carbon dioxide and propylene oxide are studied.

14. This review deals with the recent progress in the study on preparing the three-, five-, six- and seven-membered heterocycle-fused C60-fullerene derivatives via the cycloaddition reactions.

15. The research advances of the chiral ligands metal complexes catalysts used in asymmetric 1,3-dipolar cycloaddition reactions were reviewed in this paper.

16. The reaction process was pursued by FTIR to determined to be 1,3 polar cycloaddition.

17. The synthesis of polysubstituted aromatic compounds by using tandem cycloaddition aromatization reaction was reported.

18. With vinyl acetate as reactant in place of acetylene and its derivates in 1,3 dipolar cycloaddition, the target product was obtained successfully.

19. In this thesis, we have focused on the synthesis of highly substituted furan by the cycloaddition reaction of conjugated enynones with nitrones.