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38 from the product of the tandem reaction was per-
formed to exemplify a practical application of the
method as shown in Scheme 18 [27].
Finally, a [4+ + 2] cycloaddition-elimination re-
action was performed by using 3 to afford dihydroth-
iopyran derivatives with moderate stereoselectivities
under completely odorless condition [28].
Consequently, we succeeded in the preparation
of a number of odorless thiols, sulfides, as well as
selenides, and exhibiting a wide range of their ap-
plications in organic synthesis including asymmet-
ric synthesis [29–31]. It is noteworthy to empha-
size that all the reactions shown above were carried
out under odorless environment in spite of utiliz-
ing thiol-containing reagents. We believe that these
odorless organosulfur reagents could greatly serve
the chemical community in preserving environmen-
tal benignity, especially where large-scale syntheses
are concerned.
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Heteroatom Chemistry DOI 10.1002/hc