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?

enter image description here

  • 2
    $\begingroup$ 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 '17 at 16:35
  • 3
    $\begingroup$ 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 '17 at 16:54
  • 3
    $\begingroup$ Possible duplicate of Can heteroatoms with lone pairs be chiral centres? $\endgroup$ – orthocresol Dec 31 '17 at 17:09