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I am concerned about the stereogenic centres. But in this compound there is no chiral centres present. Sulphur is $\mathrm{sp^2}$-hybridized, so it cannot be chiral anyway. But I can see there is no symmetry present in this compound. Will this be a sufficient reason to tell the compound optically active?

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    $\begingroup$ This compound is in fact optically active as the sulfur has 4 different substituents, one of them being a lone pair. $\endgroup$
    – Tan Yong Boon
    Dec 31, 2017 at 16:35
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    $\begingroup$ That makes it chiral. But if the lone pair can umbrella-invert like ammonia you do not see optical activity. $\endgroup$
    – Oscar Lanzi
    Dec 31, 2017 at 16:54
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    $\begingroup$ Possible duplicate of Can heteroatoms with lone pairs be chiral centres? $\endgroup$
    – orthocresol
    Dec 31, 2017 at 17:09

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