Chains of extended twists are composed of factors
Fk=FekFJk\mathcal{F}_k=\Phi_{\varepsilon _k}\Phi_{\mathcal{J}_k}
. The set of Jordanian twists {
FJk \Phi _{\mathcal{J}_k }
} can be applied to the initial Hopf algebra
FJk ¼FJ1 FJ0 :A ® AJk ¼J0 \Phi _{\mathcal{J}_k } \cdots \Phi _{\mathcal{J}_1 } \Phi _{\mathcal{J}_0 } :\mathcal{A} \to \mathcal{A}_{\mathcal{J}_k \cdots \mathcal{J}_0 }
. In this case the remaining (transformed) factors of the chain can serve as extensions for such a multijordanian twist. We study the properties of these generalized extensions and the spectra of deformations of the corresponding Heisenberg-like algebras. The results are explicitly demonstrated for the case when
A = U(sl(N))\mathcal{A} = U(sl(N))
.