[texhax] \stackrel error

[Simmie, John]

This 
$k_{\mbox{-}1}$
gives a nice balanced symbol to indicate  the reverse of $k_1$

But this construction fails when embedded in a \stackrel{}{} command

\begin{align*}
\mathrm{(CH_3)_2\dot{C}H + \dot{C}H_2OH} &
\stackrel{k_{\mbox{-}1}}{\longrightarrow}\mathrm{(CH_3)_2CHCH_2OH (+ M)}
\\
      &  \longrightarrow
\mathrm{(CH_3)_2CHCH_2OH}^{\ast}\stackrel{k_{\mbox{-}2}}{\longrightarrow
}   \mathrm{CH_3\dot{C}HCH_2OH + \dot{C}H_3}\\  
      &  \longrightarrow
\mathrm{(CH_3)_2CHCH_2OH}^{\ast}\stackrel{k_{\mbox{-}3}}{\longrightarrow
}  \mathrm{(CH_3)_2C\bond2CH_2 + H_2O}                   \\
\end{align*}

I have to be doing something wrong ?  Right ?

Emeritus Professor John Simmie::Combustion Chemistry Centre::NUI Galway,
Ireland